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1、名詞由單數(shù)變復(fù)數(shù)的基本方法如下：
①在單數(shù)名詞詞尾加s.如：map → maps,boy→ boys,horse→ horses,table→ tables.
②s,o,x ,sh,ch結(jié)尾的詞加es.如：class→classes,box→boxes,hero→heroes,dish→dishes,bench→benches.
[注]：少數(shù)以o結(jié)尾的詞,變復(fù)數(shù)時只加s.如：photo→photos,piano→pianos.
③以輔音字母加y結(jié)尾的名詞,變y為i,再加es.如：family→families,city→cities,party→parties.
④以f或fe結(jié)尾的名詞,變f或fe為v,再加es.如：shelf→shelves,wolf→wolves,life→lives,knife→knives.
2、不規(guī)則變化：man→men,woman→women,sheep→sheep,tooth→teeth,fish→fish,child→children,ox→oxen,goose→geese
不可數(shù)名詞一般沒有復(fù)數(shù)形式,說明其數(shù)量時,要用有關(guān)計量名詞.如：a bag of rice→two bags of rice,a piece of paper→three pieces of paper,a bottle of milk→five bottles of milk.